Tuesday 18 December 2012 13.54 EST
First published on Tuesday 18 December 2012 13.54 EST

Detectives on both sides of the Irish border have made arrests in connection with the killing of Northern Ireland prison officer David Black.

Gardai detained a 44-year-old man and a 31-year-old woman who were arrested in Dublin. The pair were being questioned at Ballymun Garda station in north Dublin in connection with the killing.

The other man arrested is 36 and from County Tyrone and was being questioned by Police Service of Northern Ireland officers in the serious crime suite in Antrim.

The prison officer, a 52-year-old father of two, was shot as he drove to work on the M1 motorway in County Armagh on 1 November.

He worked at Maghaberry prison, Northern Ireland's high-security jail. A dissident republican paramilitary group styling itself as the "new IRA" admitted the killing. Their victim was the first prison officer to be murdered by paramilitaries in nearly 20 years.